35 Very Cool (and Free) Icon Sets From Smashing Magazine

Smashing Magazine - 35 (Really) Incredible Free Icon Sets

"When it comes to icons, web designers and graphic artists have an excellent opportunity to showcase their craft, prove their experience and explore their creativity. A sweet, nice icon set is a perfect showcase of designer’s work and a powerful instrument to build up your reputation online.

...

Below we present 35 incredible free icon sets which you can use for your web designs or your desktop to spice up your posts with some nice illustrations or enrich your desktop with outstanding dock icons. Some of the listed icons can be used in web designs, some of them are supposed to be primarily for desktop. So hopefully everybody will find something useful.

You might want to take a look at the following articles we’ve presented earlier:

• 20 Free And Fresh Icon Sets
• Icons For Your Desktop and Icons For Your Web Designs,
• Freebies Round-Up: Icons and Templates

Please notice: not all listed freebies can be used for commercial projects, however you can use all of them in your private projects of for you personal purposes. Please read the disclaimers carefully before using the icons - they’re changing from time to time.

..."

There are some seriously good icon's in these sets. I think my favorite is the Mammoth set...

Yes, there are "work"/normal sets too. ;)